Generac Power Systems 8 kW LP - Manual (Page 92)

Page 90
6. Measure across points G and H on the terminal strip.
12 VDC should be measured.
a. If 12 VDC is measured, proceed to Step 8.
b. If 12 VDC is not measured, proceed to Step 7.
7. Measure across point H and ground lug. 12 VDC should
be measured.
a. If 12 VDC is measured, repair or replace Wire
0 between the generator terminal strip and the
ground lug.
b. If 12 VDC is not measured, proceed to Step 8.
8. Set VOM to measure resistance.
9. Connect the meter test leads across the disconnected
Wire 0 and Wire 15B. Approximately 115 Ohms should
be measured.
a. If 115 Ohms is measured, proceed to Step 11.
b. If zero resistance or CONTINUITY is measured,
connect the meter test leads across Terminals
A and B on the transfer relay (TR1)
c. If zero resistance is measured, a short exists.
Replace TR1.
d. If 115 Ohms is measured, repair or replace
Wire 15B between the generator and the
transfer switch.
10. Disconnect the J2 connector from the printed circuit
board.
11. Measure across point M and pin location J2-8 of the con-
nector just removed. CONTINUITY should be measured.
a. If CONTINUITY is not measured, repair or
replace Wire 15B between the J2 connector
and the terminal strip.
b. If CONTINUITY was measured and the pin con-
nection looks good, the internal fuse on the PCB
has failed. Replace the printed circuit board.
teSt 46 – check Battery charGer
Supply VoltaGe
“Genready load center”
DISCUSSION:
The battery charger is supplied with 120VAC. The
output of the battery charger is 13.4 VDC / 2.5A.
PROCEDURE:
Refer to Figure 13.
1. Set VOM to measure AC voltage.
2. Measure across points A and B. 120 VAC should be
measured.
a. If 120 VAC is not measured, verify that load
source voltage is available, and that the duplex
circuit breaker in ON.
b. If 120 VAC is measured, proceed to Step 3.
3. Measure across points C and D. 120 VAC
should be measured.
a. If 120 VAC is not measured, repair or replace
Wire BC LINE or BC 00 between the load cen-
ter and the generator.
b. If 120 VAC is measured, refer to Flow Chart.
teSt 47 – check Battery charGer
output VoltaGe
“Genready load center”
DISCUSSION:
The battery charger is supplied with 120VAC. The
output of the battery charger is 13.4 VDC / 2.5A.
PROCEDURE:
Refer to Figure 13.
1. Set VOM to measure DC voltage.
2. Remove and isolate battery charger black and red leads
from generator terminal strip points E and F.
3. Measure across points E and F. Battery supply voltage
(12 VDC) should be measured.
a. If battery voltage is not measured, wait 5 min-
utes and repeat Step 3. If battery supply voltage
is still not available, refer to Flow Chart.
b. If battery voltage is measured, proceed to Step 4.
4. Reconnect battery charger black and red lead wires
previously removed in Step 2.
5. Measure across points E and F. 13.4 VDC should be
measured.
a. If 13.4 VDC is not measured, replace the
battery charger.
b. If 13.4 VDC is measured, the charger is working.
*note: Battery charger voltage will be higher than
battery supply voltage.
teSt 48 – check Wire 0/15B
“Genready load center”
DISCUSSION:
In order for the battery charger to function, battery supply
voltage must be available to the battery charger.
PROCEDURE:
Refer to Figure 13.
1. Set VOM to measure DC voltage.
2. Remove and isolate battery charger black and red leads
from generator terminal strip points E and F.
Part 3 TRANSFER SWITCH
sEctioN 3.4
DiaGNostic tEsts